Wordfish is a free, open-source UCI chess engine implementing cutting-edge search algorithms combined with neural network evaluation. Derived from fundamental chess programming principles, Wordfish analyzes positions through parallelized alpha-beta search enhanced with null-move pruning and late move reductions.
Author: Jorge Ruiz Centelles and the Stockfish developers
Wordfish 2.40 120925 what's new?
Added platform-specific logic to determine the engine’s executable directory using GetModuleFileName on Windows and _NSGetExecutablePath or readlink elsewhere, ensuring NNUE files are located correctly when Wordfish is launched from external GUI.
Scale dynamic activity bonus so it only nudges NNUE scores instead of reversing them
Reset evaluation cache with a sentinel value to avoid stale results when positions change
Refined style indicator gathering so king pressure counts only friendly attackers while shield accounts for friendly defenders minus enemy pressure, improving evaluation of exposed kings
Added a safeguard that caps optimum and maximum thinking times when total time is under one minute, helping the engine avoid time trouble in bullet games
Avoid capping thinking time based on node budgets by skipping the bullet-time limit when using nodes-as-time and ensuring the cap only applies to real-time controls
Guarantee the maximum thinking time never drops below the optimum time, preventing engine exceptions under GUI usage
Wordfish 1.0 vs other engines:
| Defenchess 2.3 JA | 19/20 | +18 | 20 Games |
| Rebel Extreme 1.1 | 17.5/20 | +15 | 20 Games |
| Integral 7 dev.8bab JA | 11/20 | +2 | 20 Games |
| Spirit 100825 | 10/20 | +0 | 20 Games |
| Spirit 040825 | 10/20 | +0 | 20 Games |
| Senpai 2.0 JA | 18.5/19 | +18 | 19 Games |
| Omega 10 | 9.5/18 | +1 | 18 Games |
| Yuliana 7.0 | 9/18 | +0 | 18 Games |
| SF-PRO2 02.05.2025 | 9/18 | +0 | 18 Games |
| YuliGM Pro 20 | 9/18 | +0 | 18 Games |
| Stockfish dev-20250809 | 9/18 | +0 | 18 Games |
| Trout 1.0 JA | 10/10 | +10 | 10 Games |
| Pounce 1.2.4.8 JA | 10/10 | +10 | 10 Games |
| Petrel 1.0 JA | 10/10 | +10 | 10 Games |
| Molybdenum 4.1 JA | 9.5/10 | +9 | 10 Games |
| Fire 10 mingw | 6.5/10 | +3 | 10 Games |
| Pawn 4.0.4 JA | 6.5/10 | +3 | 10 Games |
| Fisherov chess monk 1.2 | 5.5/10 | +1 | 10 Games |
| Yuliirma 5.0 | 5/10 | +0 | 10 Games |
| Stockfish 17.1 | 5/10 | +0 | 10 Games |
| Alexandria 8.1.0 | 5/10 | +0 | 10 Games |
Wordfish 2.40 120925 download mirror
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